might have 怎么用?

might have 怎么用? might have may have done 和 might have done 都怎么用啊,通俗易懂啊, might /might have done 区别 might as 该怎么用? if you have a fever,you might have the flu中为什么用might,不用will might have done可不可以. might have to take might i might as well have them. 用may/might have; must have; should/ought to have; could have 请问这一题为什么用might have been might have done的用法